You should submit the medical form with your application or else you risk denial. Ask your doctor when he expects to release the form to you.
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If you will mail your package without medical exam , uscis will sent you a request to provide a medical exam. Usually you have 87 days to provide additional evidence.
The civil surgeon should complete everything before giving you the medical exam results. Get the shots, complete the medical and send everything in together. If you submit the package without the medical you risk having your paperwork rejected. If it is not rejected you should not submit the medical unless USCIS requests it (otherwise they will lose it) or you can bring it to your interview. Best though is to submit everything together. If you have any other questions you can reach me thru my website below. Good luck!
This response does not create an attorney client relationship and is for informational purposes only. Before acting on this information you should discuss your problem with an immigration attorney.